EP 0110899 B1 19870121 - MODIFIED ZIRCONIA INDUCTION FURNACE
Title (en)
MODIFIED ZIRCONIA INDUCTION FURNACE
Publication
Application
Priority
- US 38306682 A 19820528
- US 38338682 A 19820528
Abstract (en)
[origin: GB2121028A] A high frequency induction furnace (10) for reflowing a portion of a lightguide preform (44) in order to draw a fiber (52) therefrom. The furnace (10) has a centrally located tubular susceptor (34) therein. A high frequency coil (38) is energized to couple its elecromagnetic field to the susceptor (34) to heat and reflow a portion of the preform (44) in order to draw the fiber (52) therefrom. The susceptor has a thin coating of the preform material (e.g., silica) on at least a portion of the inside surface thereof. In a further embodiment a cylinder (62) is positioned in concentric, spaced relation about the susceptor (34) and is surrounded by an insulating grain (36). A thin coating of the preform material may be additionally provided on at least a portion of either the outer surface of the susceptor or the inner surface of the cylinder. The thin coating prevents contaminating particulates from migrating from small cracks in the inside surface of the susceptor (34) onto the preform (44) while the cylinder (62) prevents small particulate emanating from the insulating grain (36) from being drawn through larger cracks in the susceptor and onto the preform and/or the fiber (52).
IPC 1-7
IPC 8 full level
C03B 37/029 (2006.01); H05B 6/02 (2006.01)
CPC (source: EP)
C03B 37/029 (2013.01); C03B 2205/63 (2013.01); C03B 2205/64 (2013.01); C03B 2205/70 (2013.01)
Designated contracting state (EPC)
BE DE FR NL SE
DOCDB simple family (publication)
GB 2121028 A 19831214; GB 2121028 B 19860319; GB 8314808 D0 19830706; DE 3369452 D1 19870226; EP 0110899 A1 19840620; EP 0110899 A4 19840928; EP 0110899 B1 19870121; IT 1171073 B 19870610; IT 8321323 A0 19830526; WO 8304364 A1 19831208
DOCDB simple family (application)
GB 8314808 A 19830527; DE 3369452 T 19830411; EP 83901557 A 19830411; IT 2132383 A 19830526; US 8300512 W 19830411